Chad's president has ordered the military to retaliate against future attacks from Sudan following a drone attack that killed at least 17 people and injured several other people attending a funeral.
...
The paramilitary Rapid Support Forces (RSF), which controls most of the western Darfur region bordering Chad, is suspected of carrying out the attack. It denies any involvement and blames Sudan's army, which has blamed the RSF.

The Sudanese government has often accused Chad of supporting the RSF with weapons and mercenaries, claims which N'Djamena denies.
...
The paramilitary Rapid Support Forces (RSF), which controls most of the western Darfur region bordering Chad, is suspected of carrying out the attack. It denies any involvement and blames Sudan's army, which has blamed the RSF.

The Sudanese government has often accused Chad of supporting the RSF with weapons and mercenaries, claims which N'Djamena denies.

https://www.bbc.co.uk/news/articles/c0mjn0g708ro